Ultra high frequency circuit conductor member



Patented Aug. 15, 1944 UNITED STATES PATENT OFFICE?- ULTRA HIGH FREQUENCY CIRCUIT CONDUCTOR MEMBER Christopher Henry Fonikes, London, England, assignor to International Standard Electric Corporation, New York, N. Y.

No Drawing. Application July 1, 1942, Serial No. 149,359. In Great Britain January '1, 1 941 4 Claims.

' marks, scratches or ridges of any kindin a direction inclined to current flow, therefore increases the length of the current path, and the circuit becomes very inefficient.

In accordance with the invention, therefore, it is proposed to polish or burnish a high frequency current-conducting surface of a conductor forming part ,of an ultra high frequency circuit with a motion which is parallel to the direction of current flow. In this manner all die marks, scratches and other surface irregularities in a direction inclined to the direction of current flow are removed: and the direction in which the conductor has been polished or bur- 2,s2o,aso dated June 1, 1943, the direction of current flow is parallel to the axis, and it has nished is, oflcourse readily perceptible when the operation is completed.

The invention has been applied with surprisingly satisfactory results to hollow resonators forming parts of velocity modulated electron discharge tubes. For example, in such a resona= tor constituted by a length of coaxial l e of the kind described in United States a'ppl cation NO; 367,401; filed by J. H. Fremlin on November 27, 1940, for Electron discharge apparatus, and

. which application has matured\ to Patent vNo.

been found that an improvement of up to 30% in efficiency is obtained when the inside surface is polished or burnished with particular care with a motion parallel to the axis of the resonator. For convenience the terms p0lishins" and P lshed in the claims are intended to include burnishing and similar surface smoothing operations and the resulting surfaces.

What is claimed is:

1. The method of prep e s ace of an electrical conductor forming part of an ultra high frequency circuit, which consists in polishing said surface with ammotion parallel to the 'directionof intended current flow, whereby such surface marks as remain are in the said direction.

v2. An electrical conductor member adapted to form part of an ultra high frequency circuit, having a polished surface along which a high frequency current is intended to flow, said surface being of the type produced by polishing with a motion parallel to the intended direction of said flow and characterized by the fact that all material surface irregularities extend parallel to such flow.

3. A hollow resonator adapted for use in a velocity modulated electron discharge tube having a polished inner surface as set forth in claim 2.;

4. A hollow resonator adapted for use in an velocity modulated electrondischarge tube comprising a length of coaxial linehaving a polished P inner surface as set forthjin claim 2.

crnus'rorrma HENRY FOULKES. 

